fig2
From: Polymer engineering in hydrogel-based moisture-electric generators for green energy harvesting
Figure 2. Representative advancements in the development trajectory of HMEGs. Reproduced with permission[56]. Copyright©2020, Royal Society of Chemistry. Reproduced with permission[59]. Copyright©2022, Wiley-VCH, under CC BY 4.0. Reproduced with permission[55]. Copyright©2023, Wiley-VCH. Reproduced with permission[62]. Copyright©2024, Nature Publishing Group. HMEGs: Hydrogel-based moisture-electric generators.
